Cycling of the Mechanical Ventilator Breath

Author: Gentile, Michael A

Source: Respiratory Care, Volume 56, Number 1, January 2011 , pp. 52-60(9)

Publisher: The Journal Respiratory Care Company

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Patient-ventilator interaction is a key element in optimizing mechanical ventilation. The change from inspiration to expiration is a crucial point in the mechanically ventilated breath, and is termed “cycling.” Patient-ventilator asynchrony may occur if the flow at which the ventilator cycles to exhalation does not coincide with the termination of neural inspiration. Ideally, the ventilator terminates inspiratory flow in synchrony with the patient's neural timing, but frequently the ventilator terminates inspiration either early or late. Most current mechanical ventilators include adjustable cycling features that, when used in conjunction with waveform graphics, can enhance patient-ventilator synchrony.

Keywords: asynchrony; cycling criterion; delayed cycling; expiratory asynchrony; patient-ventilator interaction; premature cycling; pressure-support ventilation

Document Type: Research Article


Affiliations: Division of Pulmonary and Critical Care Medicine, Box 3046, Duke University Medical Center, Durham NC 27710, USA.

Publication date: January 1, 2011

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